Patent US2492922A successfully refreshed from Google Patents.
US2492922A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hollow educational block
Assignee: Kusan Inc
•
Filing: 1947-05-23
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Granted: 1949-12-27
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Expires: 1967-05-23
Abstract
No abstract record available.
Inventors
- 👤 William R Mclain
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 00:09
CPC Classifications
A; A63; A63H; A63H33/00
Claims Analysis
Total Claims: 0
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US2235801A
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US2440205A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-12-26 | 1953-06-27 | 1953-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-12-26 | 1957-06-27 | 1957-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-12-26 | 1961-06-27 | 1961-12-27 | $7700.00 | Window Closed / Lapsed |